Synthesis Of Hollow Nanoparticles Research Articles

Synthesis of Hollow Nanoparticles by Polyethylenimine, Boronate Affinity and Molecular Imprinting for Efficient and Selective Extraction of Ovalbumin

Synthesis of Hollow Nanoparticles by Polyethylenimine, Boronate Affinity and Molecular Imprinting for Efficient and Selective Extraction of Ovalbumin

Understanding the Stability of Hollow Nanoparticles with Polycrystalline Shells

The existence of polycrystalline shells has been widely reported in the synthesis of hollow nanoparticles; however, the exact role displayed by the grain boundaries on the stability has been scarce...

Seed-mediated phase-selective growth of Cu2GeS3 hollow nanoparticles with huge cavities

Although significant progress has been achieved in the synthesis of hollow nanoparticles (NPs), research on copper-based multinary chalcogenide (CMC) semiconductor NPs with hollow structures is still less developed.

Formation of Hollow Co3O4 Nanoparticles on Nitrogen–doped Porous Carbons for Highly Capacitive Performance

AbstractCo3O4 nanoparticles are incorporated into nitrogen‐doped porous carbons to investigate their potential as supercapacitors. The nano‐sized Co3O4 particles grow and their morphology becomes hollow on the carbon support, which is attributed to the atomic diffusion (the Kirkendall effect) during the annealing. The cobalt‐doped composites have high BET surface areas of about 3000 m2 g−1 and possess mesopore‐dominant structures caused by the hollow Co3O4 nanoparticles. As a result, the hollow Co3O4 in the composites simultaneously induces both enhanced pseudo‐capacitance and efficient pore structure for energy storage. The specific capacitance of the composites is as high as 300 F g−1 in an aqueous solution of 6 M KOH at 1 A g−1, and the material shows competitive specific capacitance of 210 F g−1 at 10 A g−1 for a high power density. The present study provides a unique insight into the synthesis of hollow nanoparticles on a porous substrate material for high‐performance supercapacitance.

Metallic Double Shell Hollow Nanocages: The Challenges of Their Synthetic Techniques

Hollow metallic nanoparticles have been attracting the attention of many researchers in the past five years due to their new properties and potential applications. The unique structure of the hollow nanoparticles; presence of two surfaces (internal and external), and the presence of both cavities and pores in the wall surfaces of these nanoparticles are responsible for their unique properties and applications. Here the galvanic replacement technique is used to prepare nanocages made of gold, platinum, and palladium. In addition, hollow double shell nanoparticles are made of two metal shells like Au-Pt, Pt-Au, Au-Pd, Pd-Au, Pd-Pt, and Pt-Pd. Silver nanocubes are used as templates during the synthesis of hollow nanoparticles with single metal shell or double shell nanocages. Most of the problems that could affect the synthesis of solid Silver nanocubes used as template as well as the double shell nanocages and their possible solutions are discussed in a detail. The sizes and shapes of the single-shell and double-shell nanocages were characterized by a regular and high-resolution TEM. A SEM mapping technique is also used to image the surface atoms for the double shell hollow nanoparticles in order to determine the thickness of the two metal shells. In addition, optical studies are used to monitor the effect of the dielectric properties of the other metals on the plasmonic properties of the gold nanoshell in these mixed nanoparticles.

A Novel Side-Selective Galvanic Reaction and Synthesis of Hollow Nanoparticles with an Alloy Core

Hollow nanoparticles with an alloy core (HNACs) have been prepared by a novel side-selective galvanic reaction. Seeding growth first is used to synthesize Au@Ag nanoparticles (NPs), which react with HAuCl4 to form HNAC NPs. Through adjusting the core size, the amount of HAuCl4, and the diameter of Au@Ag, fabrications of various HNACs are achieved. By using high-resolution transmission electron microscopy, energy-dispersive X-ray spectrometry, field emission scanning electron microscopy, and UV−vis spectroscopy, the galvanic etching process is observed. We find the galvanic reaction is side-selective compared to previously reported reactions. Three features are believed to play important roles: (1) interfacial alloying between the Au core and Ag shell, (2) the structure of Au@Ag (the Au core is not right center), and (3) the Au-content-dependent galvanic reaction. Prepared HNACs have a rough surface and porous structure, which indicates they can capture more molecules with affinity. Also, these hydrophobic...

Synthesis of hollow nanoparticles by plasma polymerization

A capacitively coupled low pressure plasma is used to produce particles by plasma polymerization of various organic precursors. The particles produced by this method are spherical, submicron in diameter, and contain a hollow center. Sixteen organic molecules were tested for the ability to produce hollow particles. Of these, 12 were found to reproducibly result in the formation of hollow particles while the other 4 either produced non-hollow particles or no particles at all under the conditions investigated here. Cyclohexane derivatives and the presence of an aromatic ring correlate strongly with a tendency to form hollow centers. The particle sizes vary from 70 nm to nearly 1 μm and the core diameter is on the average 18 of the particle diameter. The corresponding shell thickness ranges from 24 nm for styrene to about 360 nm for cyclohexane. To explain the formation of hollow centers a mechanism is proposed based on the hypothesis that the solid phase is formed via crosslinking and solidification of viscous drop. This mechanism explains the observed linear relationship between core size and particle size.